1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2012 (C), Jason Cooper <jason@lakedaemon.net> 4 * 5 * arch/arm/mach-mvebu/kirkwood.c 6 * 7 * Flattened Device Tree board initialization 8 */ 9 10 #include <linux/clk.h> 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/mbus.h> 14 #include <linux/of.h> 15 #include <linux/of_address.h> 16 #include <linux/of_net.h> 17 #include <linux/of_platform.h> 18 #include <linux/platform_device.h> 19 #include <linux/slab.h> 20 #include <asm/hardware/cache-feroceon-l2.h> 21 #include <asm/mach/arch.h> 22 #include <asm/mach/map.h> 23 #include "kirkwood.h" 24 #include "kirkwood-pm.h" 25 #include "common.h" 26 27 static struct resource kirkwood_cpufreq_resources[] = { 28 [0] = { 29 .start = CPU_CONTROL_PHYS, 30 .end = CPU_CONTROL_PHYS + 3, 31 .flags = IORESOURCE_MEM, 32 }, 33 }; 34 35 static struct platform_device kirkwood_cpufreq_device = { 36 .name = "kirkwood-cpufreq", 37 .id = -1, 38 .num_resources = ARRAY_SIZE(kirkwood_cpufreq_resources), 39 .resource = kirkwood_cpufreq_resources, 40 }; 41 42 static void __init kirkwood_cpufreq_init(void) 43 { 44 platform_device_register(&kirkwood_cpufreq_device); 45 } 46 47 static struct resource kirkwood_cpuidle_resource[] = { 48 { 49 .flags = IORESOURCE_MEM, 50 .start = DDR_OPERATION_BASE, 51 .end = DDR_OPERATION_BASE + 3, 52 }, 53 }; 54 55 static struct platform_device kirkwood_cpuidle = { 56 .name = "kirkwood_cpuidle", 57 .id = -1, 58 .resource = kirkwood_cpuidle_resource, 59 .num_resources = 1, 60 }; 61 62 static void __init kirkwood_cpuidle_init(void) 63 { 64 platform_device_register(&kirkwood_cpuidle); 65 } 66 67 #define MV643XX_ETH_MAC_ADDR_LOW 0x0414 68 #define MV643XX_ETH_MAC_ADDR_HIGH 0x0418 69 70 static void __init kirkwood_dt_eth_fixup(void) 71 { 72 struct device_node *np; 73 74 /* 75 * The ethernet interfaces forget the MAC address assigned by u-boot 76 * if the clocks are turned off. Usually, u-boot on kirkwood boards 77 * has no DT support to properly set local-mac-address property. 78 * As a workaround, we get the MAC address from mv643xx_eth registers 79 * and update the port device node if no valid MAC address is set. 80 */ 81 for_each_compatible_node(np, NULL, "marvell,kirkwood-eth-port") { 82 struct device_node *pnp = of_get_parent(np); 83 struct clk *clk; 84 struct property *pmac; 85 u8 tmpmac[ETH_ALEN]; 86 void __iomem *io; 87 u8 *macaddr; 88 u32 reg; 89 90 if (!pnp) 91 continue; 92 93 /* skip disabled nodes or nodes with valid MAC address*/ 94 if (!of_device_is_available(pnp) || 95 !of_get_mac_address(np, tmpmac)) 96 goto eth_fixup_skip; 97 98 clk = of_clk_get(pnp, 0); 99 if (IS_ERR(clk)) 100 goto eth_fixup_skip; 101 102 io = of_iomap(pnp, 0); 103 if (!io) 104 goto eth_fixup_no_map; 105 106 /* ensure port clock is not gated to not hang CPU */ 107 clk_prepare_enable(clk); 108 109 /* store MAC address register contents in local-mac-address */ 110 pmac = kzalloc(sizeof(*pmac) + 6, GFP_KERNEL); 111 if (!pmac) 112 goto eth_fixup_no_mem; 113 114 pmac->value = pmac + 1; 115 pmac->length = 6; 116 pmac->name = kstrdup("local-mac-address", GFP_KERNEL); 117 if (!pmac->name) { 118 kfree(pmac); 119 goto eth_fixup_no_mem; 120 } 121 122 macaddr = pmac->value; 123 reg = readl(io + MV643XX_ETH_MAC_ADDR_HIGH); 124 macaddr[0] = (reg >> 24) & 0xff; 125 macaddr[1] = (reg >> 16) & 0xff; 126 macaddr[2] = (reg >> 8) & 0xff; 127 macaddr[3] = reg & 0xff; 128 129 reg = readl(io + MV643XX_ETH_MAC_ADDR_LOW); 130 macaddr[4] = (reg >> 8) & 0xff; 131 macaddr[5] = reg & 0xff; 132 133 of_update_property(np, pmac); 134 135 eth_fixup_no_mem: 136 iounmap(io); 137 clk_disable_unprepare(clk); 138 eth_fixup_no_map: 139 clk_put(clk); 140 eth_fixup_skip: 141 of_node_put(pnp); 142 } 143 } 144 145 /* 146 * Disable propagation of mbus errors to the CPU local bus, as this 147 * causes mbus errors (which can occur for example for PCI aborts) to 148 * throw CPU aborts, which we're not set up to deal with. 149 */ 150 static void kirkwood_disable_mbus_error_propagation(void) 151 { 152 void __iomem *cpu_config; 153 154 cpu_config = ioremap(CPU_CONFIG_PHYS, 4); 155 writel(readl(cpu_config) & ~CPU_CONFIG_ERROR_PROP, cpu_config); 156 } 157 158 static struct of_dev_auxdata auxdata[] __initdata = { 159 OF_DEV_AUXDATA("marvell,kirkwood-audio", 0xf10a0000, 160 "mvebu-audio", NULL), 161 { /* sentinel */ } 162 }; 163 164 static void __init kirkwood_dt_init(void) 165 { 166 kirkwood_disable_mbus_error_propagation(); 167 168 BUG_ON(mvebu_mbus_dt_init(false)); 169 170 #ifdef CONFIG_CACHE_FEROCEON_L2 171 feroceon_of_init(); 172 #endif 173 kirkwood_cpufreq_init(); 174 kirkwood_cpuidle_init(); 175 176 kirkwood_pm_init(); 177 kirkwood_dt_eth_fixup(); 178 179 of_platform_default_populate(NULL, auxdata, NULL); 180 } 181 182 static const char * const kirkwood_dt_board_compat[] __initconst = { 183 "marvell,kirkwood", 184 NULL 185 }; 186 187 DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)") 188 /* Maintainer: Jason Cooper <jason@lakedaemon.net> */ 189 .init_machine = kirkwood_dt_init, 190 .restart = mvebu_restart, 191 .dt_compat = kirkwood_dt_board_compat, 192 MACHINE_END 193